While flying south toward Seminole, TX, in a helicopter under night vision goggles, myself and another crewmember observed a triangular shaped craft (actually it was more like a small triangle closely in front of another larger triangle).

There were many lights observed on the bottom of the craft. The craft was flying fairly fast from south to north and appeared to be around 20,000 feet msl or so. There was nothing particularly unusual about the flight characteristics however its odd shape caught our attention.